Communication terminal, and over-interference prevention method

Abstract

The presence of a need for a handover operation is checked in the case of the rapid increase in the power values of received signals at a mobile communication terminal. Thereafter, if required, transmission rates of control data necessary for a handover operation, and of signals required for link maintenance are controlled not to be reduced, and a transmission rate of information data is controlled to rapidly be reduced. And if not needed, the transmission power is controlled to be reduced without changing the transmission rate.

What is claimed is:  
     
       1. A communication terminal comprising: 
       a detection means for detection of rapid increase in a total sum of power values of all the received signals; and  
       a control means for reduction in an information transmission rate in the case of rapid increase in said total sum.  
     
     
       2. A communication terminal according to  claim 1 , wherein transmission rates of control signals necessary for a handover operation and of signals required for link maintenance are controlled not to be reduced by said control means in the case of rapid increase in said total sum of the power values of all the received signals. 
     
     
       3. A communication terminal according to  claim 1  further comprising: 
       a judging means for judging in the case of the rapid increase in said total sum of the power values of all the received signals whether said increase is attributed to a communication other station, wherein  
       transmission rates of control signals necessary for a handover operation and signals required for link maintenance are controlled not to be reduced, and said information transmission rate is done to be reduced, when said increase is attributed not to said communication other station, by said control means.  
     
     
       4. A communication terminal according to  claim 3 , wherein transmission power control is performed according to instructions from a communication anthor station without reducing the information transmission rate, when said increase is attributed to said communication other station. 
     
     
       5. A communication terminal according to  claim 1 , wherein said information transmission rate is reduced when it is possible to do so, and information transmission is stopped, when it is not possible to reduce said rate, under communication where there is rapid increase in said total sum of the power values of all the received signals, and instantaneous response is required. 
     
     
       6. A communication terminal according to  claim 5 , wherein transmission rates of control signals necessary for a handover operation, and of signals necessary for link maintenance are not reduced, or transmission of said control signals and said signals is not stopped, in the case of said rapid increase. 
     
     
       7. A communication terminal according to  claim 5 , further comprising: 
       a judging means for judging in the case of said rapid increase whether said increase is attributed to a communication other station, wherein  
       said information transmission rate is controlled to be reduced when it is possible to do so, and said information transmission is controlled to be stopped, when it is not possible to reduce said information transmission rate, by said control means, under communication, requiring instantaneous response, where said increase is not attributed to said communication other station, and transmission rates of control signals necessary for a handover operation, and of signals necessary for link maintenance are not reduced, or transmission of said control signals and said signals is not stopped.  
     
     
       8. A communication terminal according to  claim 7 , wherein transmission power control is performed according to instructions from a communication other station without reducing said information transmission rate, or stopping said information transmission, when said increase is attributed to said communication other station. 
     
     
       9. Devices of a base station for radio communication with a communication terminal, said communication terminal comprising: 
       a detection means for detection of rapid increase in a total sum of power values of all the received signals; and  
       a control means for reduction in an information transmission rate in the case of said increase.  
     
     
       10. An over-interference prevention method, comprising: 
       a detection process to detect increase in the total sum of the power values of all the received signals, and  
       a control process to reduce an information transmission rate in the case of rapid increase in said total sum.  
     
     
       11. An over-interference prevention method according to  claim 10 , wherein 
       transmission rates of control signals necessary for a handover operation and of signals required for link maintenance are controlled not to be reduced, in said control process.  
     
     
       12. An over-interference prevention method according to  claim 10 , comprising: 
       a judging process to judge in the case of said increase whether said increase is attributed to a communication other station, wherein  
       transmission rates of control signals necessary for a handover operation and signals required for link maintenance are controlled not to be reduced, and said information transmission rate is done to be reduced, when said increase is attributed not to said communication other station, in said control process.  
     
     
       13. An over-interference prevention method according to  claim 12 , wherein 
       transmission power control is performed according to instructions from a communication other station without reduction in said information transmission rate, when said increase is attributed to said communication other station.  
     
     
       14. An over-interference prevention method according to  claim 10 , wherein 
       said information transmission rate is reduced when it is possible to do so, and  
       information transmission is stopped, when it is not possible to reduce said information transmission rate, under communication requiring instantaneous response in the case of said increase.  
     
     
       15. A transmission power control method according to  claim 14 , wherein transmission rates of control signals necessary for a handover operation and of signals required for link maintenance are controlled not to be reduced, or transmission of said signals is done not to be stopped in said control process, under communication requiring instantaneous response in the case of said increase. 
     
     
       16. An over-interference prevention method according to  claim 14 , further comprising: 
       a judging process for judging in the case of said increase whether said increase is attributed to a communication other station; wherein  
       said information transmission rate is controlled to be reduced when it is possible to do so, and said information transmission is controlled to be stopped, when it is not possible to reduce said information transmission rate, in said control process, under communication, requiring instantaneous response, where said increase is not attributed to said communication other station, and transmission rates of control signals necessary for a handover operation, and of signals necessary for link maintenance are not reduced, or transmission of said control signals and said signals is not stopped.  
     
     
       17. An over-interference prevention method according to  claim 16 , wherein transmission power control is performed according to instructions from a communication without reducing said information transmission rate, or stopping said information transmission, when said increase is attributed to said communication other station.